Light-emitting device, electronic device, and lighting device

Abstract

A light-emitting device, an electronic device, or a lighting device with low power consumption and high reliability is provided. The light-emitting device includes a first light-emitting element, a second light-emitting element, a third light-emitting element, and a fourth light-emitting element. The first to fourth light-emitting elements include the same EL layer between an anode and a cathode. The EL layer includes a first light-emitting layer and a second light-emitting layer. The first light-emitting layer contains a fluorescent substance. The peak wavelength of an emission spectrum of the fluorescent substance in a toluene solution of the fluorescent substance is 440 nm to 460 nm, preferably 440 nm to 455 nm. The second light-emitting layer contains a phosphorescent substance. The first light-emitting element exhibits blue emission. The second light-emitting element exhibits green emission. The third light-emitting element exhibits red emission. The fourth light-emitting element exhibits yellow emission.

The invention claimed is: 
     
       1. A light-emitting device comprising:
 a first light-emitting element emitting blue light; 
 a second light-emitting element emitting green light; 
 a third light-emitting element emitting red light; and 
 a fourth light-emitting element, 
 wherein the first light-emitting element, the second light-emitting element, the third light-emitting element, and the fourth light-emitting element comprise the same EL layer, 
 wherein the EL layer comprises a first EL layer comprising a first light-emitting layer, a second EL layer comprising a second light-emitting layer, and a charge-generation layer between the first EL layer and the second EL layer, 
 wherein the first light-emitting layer includes a fluorescent substance, 
 wherein the second light-emitting layer includes a phosphorescent substance, and 
 wherein the fluorescent substance is an organic compound in which each of two benzo[b]naphtho[1,2-d]furanylamine skeletons is independently bonded to a pyrene skeleton. 
 
     
     
       2. The light-emitting device according to  claim 1 , wherein the second light-emitting layer emits yellow phosphorescence. 
     
     
       3. The light-emitting device according to  claim 1 ,
 wherein a peak wavelength of the blue light is greater than or equal to 400 nm and less than or equal to 480 nm, 
 wherein a peak wavelength of the green light is greater than or equal to 500 nm and less than or equal to 560 nm, and 
 wherein a peak wavelength of the red light is greater than or equal to 580 nm and less than or equal to 680 nm. 
 
     
     
       4. The light-emitting device according to  claim 1 ,
 wherein the fourth light-emitting element emits yellow light, and 
 wherein a peak wavelength of the yellow light is greater than or equal to 555 nm and less than or equal to 590 nm. 
 
     
     
       5. The light-emitting device according to  claim 1 , wherein the two benzo[b]naphtho[1,2-d]furanylamine skeletons are respectively bonded to the 1-position and the 6-position of the pyrene skeleton. 
     
     
       6. The light-emitting device according to  claim 1 , wherein each of nitrogen atoms in the two benzo[b]naphtho[1,2-d]furanylamine skeletons is independently bonded to the 6-position or the 8-position of a benzo[b]naphtho[1,2-d]furanyl group. 
     
     
       7. The light-emitting device according to  claim 1 ,
 wherein the organic compound is represented by Formula (G1) 
 
       
         
           
           
               
               
           
         
         wherein each of Ar 1  and Ar 2  independently represents a substituted or unsubstituted aryl group having 6 to 13 carbon atoms forming a ring, and 
         wherein each of R 1  to R 8 , R 10  to R 18 , and R 20  to R 28  independently represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 6 carbon atoms, a cyano group, halogen, a substituted or unsubstituted haloalkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms. 
       
     
     
       8. The light-emitting device according to  claim 1 ,
 wherein the organic compound is represented by Formula (G2) 
 
       
         
           
           
               
               
           
         
       
       and
 wherein each of R 1  to R 8  and R 29  to R 38  independently represents hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 6 carbon atoms, a cyano group, halogen, a substituted or unsubstituted haloalkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 10 carbon atoms. 
 
     
     
       9. The light-emitting device according to  claim 1 ,
 wherein the organic compound is represented by Formula (132) 
 
       
         
           
           
               
               
           
         
       
     
     
       10. An electronic device comprising the light-emitting device according to  claim 1 . 
     
     
       11. A lighting device comprising the light-emitting device according to  claim 1 . 
     
     
       12. A light-emitting device comprising:
 a first light-emitting element emitting blue light; 
 a second light-emitting element emitting green light; 
 a third light-emitting element emitting red light; and 
 a fourth light-emitting element emitting yellow light, 
 wherein the first light-emitting element, the second light-emitting element, the third light-emitting element, and the fourth light-emitting element comprise the same EL layer, 
 wherein the EL layer comprises a first EL layer comprising a first light-emitting layer, a second EL layer comprising a second light-emitting layer, and a charge-generation layer between the first EL layer and the second EL layer, 
 wherein the first light-emitting layer includes a fluorescent substance, 
 wherein the second light-emitting layer includes a phosphorescent substance, and 
 wherein a peak wavelength of an emission spectrum of the fluorescent substance in a toluene solution of the fluorescent substance is greater than or equal to 440 nm and less than or equal to 460 nm. 
 
     
     
       13. The light-emitting device according to  claim 12 , wherein the second light-emitting layer emits yellow phosphorescence. 
     
     
       14. The light-emitting device according to  claim 12 ,
 wherein a peak wavelength of the blue light is greater than or equal to 400 nm and less than or equal to 480 nm, 
 wherein a peak wavelength of the green light is greater than or equal to 500 nm and less than or equal to 560 nm, 
 wherein a peak wavelength of the red light is greater than or equal to 580 nm and less than or equal to 680 nm, and 
 wherein a peak wavelength of the yellow light is greater than or equal to 555 nm and less than or equal to 590 nm. 
 
     
     
       15. The light-emitting device according to  claim 12 , wherein a half-width of the emission spectrum of the fluorescent substance in the toluene solution is greater than or equal to 20 nm and less than or equal to 50 nm. 
     
     
       16. The light-emitting device according to  claim 12 , wherein the first light-emitting element has an x-coordinate greater than or equal to 0.13 and less than or equal to 0.17 and a y-coordinate greater than or equal to 0.03 and less than or equal to 0.07 on an xy chromaticity diagram. 
     
     
       17. The light-emitting device according to  claim 12 , wherein the fluorescent substance has an aromatic diamine skeleton. 
     
     
       18. The light-emitting device according to  claim 12 , wherein the fluorescent substance has a pyrenediamine skeleton. 
     
     
       19. An electronic device comprising the light-emitting device according to  claim 12 . 
     
     
       20. A lighting device comprising the light-emitting device according to  claim 12 .